diff --git a/app/build.gradle b/app/build.gradle
index c943e8ba..cdba3720 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -14,6 +14,7 @@ def gitDescribe = { ->
 }
 
 android {
+    namespace 'com.stevesoltys.seedvault'
     compileSdk rootProject.ext.compileSdk
 
     defaultConfig {
diff --git a/contactsbackup/build.gradle b/contactsbackup/build.gradle
index f0f1f5e1..a3d885a2 100644
--- a/contactsbackup/build.gradle
+++ b/contactsbackup/build.gradle
@@ -9,6 +9,7 @@ plugins {
 }
 
 android {
+    namespace 'org.calyxos.backup.contacts'
     compileSdk rootProject.ext.compileSdk
 
     defaultConfig {
diff --git a/storage/demo/build.gradle b/storage/demo/build.gradle
index b42c797a..75aa450e 100644
--- a/storage/demo/build.gradle
+++ b/storage/demo/build.gradle
@@ -11,6 +11,7 @@ plugins {
 }
 
 android {
+    namespace 'de.grobox.storagebackuptester'
     compileSdk rootProject.ext.compileSdk
 
     defaultConfig {
diff --git a/storage/lib/build.gradle b/storage/lib/build.gradle
index e2f032d5..3df7ed72 100644
--- a/storage/lib/build.gradle
+++ b/storage/lib/build.gradle
@@ -13,6 +13,7 @@ plugins {
 }
 
 android {
+    namespace 'org.calyxos.backup.storage'
     compileSdk rootProject.ext.compileSdk
 
     defaultConfig {